Alternator A.R.K4E

A.R.K4E Alternator – High-Efficiency, Brushless, and Industrial-Grade Power Generation

The A.R.K4E alternator, developed by Arken Power Solutions, is a three-phase brushless synchronous alternator designed for reliable and efficient performance in prime and standby power systems. It delivers stable voltage regulation within ±1% and less than 5% THD, ensuring clean and consistent power for sensitive electrical loads. Equipped with Class H insulation, IP23 protection, and a self-excited excitation system, it offers durability, low maintenance, and high efficiency up to 94.3%. Certified under IEC60034, BS5000, NEMA MG1-22, and ISO9001, the A.R.K4E alternator provides dependable power for industrial, rental, and telecom generator applications.

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Alternator Model

ARK4E

50Hz (kVA)

325

60Hz (kVA)

394
Control SystemSELF EXCITED
A.V.R. MX341 WITH PMG
Voltage Regulation ± 1.0 %
Sustained Short Circuit >300% OF RATED CURRENT
Rated Power Factor0.8

Electrical Performance

  • Type: Three-phase, brushless, self-excited synchronous alternator

  • Frequency: 50 / 60 Hz

  • Power Factor: 0.8

  • Voltage Range: 380/220V – 480/277V (configurable in star, delta, or parallel star)

  • Voltage Regulation: ±1.0%

  • Total Harmonic Distortion (THD): <5% (balanced load), <1.5% (no load)

  • Sustained Short Circuit Current: >300% of rated current for 10 seconds

  • Efficiency: Up to 94.3% at full load

  • Telephone Harmonic Factor (THF): <2%

  • Telephone Interference Factor (TIF): <50

  • Overload Capacity: 110% for one hour in a six-hour cycle

  • Reactances:

    • Xd: 2.79–3.33

    • X’d: 0.14–0.20

    • X’’d: 0.10–0.14

    • Xq: 2.01–2.80

    • X’’q: 0.25–0.39

  • Time Constants:

    • Transient (T’d): 0.08 s

    • Subtransient (T’’d): 0.019 s

    • Armature (Ta): 0.018 s

  • Short Circuit Ratio (1/Xd): 0.09 typical

Construction & Design

  • Insulation Class: H (125°C rise at 40°C ambient)

  • Protection: IP23

  • Cooling System: Self-ventilated airflow (0.486 m³/s @50Hz, 0.580 m³/s @60Hz)

  • Frame Structure: Steel frame with cast aluminum front and rear covers

  • Winding: Double-layer stator winding with 2/3 pitch to minimize harmonic distortion

  • Rotor: Damped rotor with high mechanical balance and low vibration

  • Bearings:

    • Drive End: 6317 (sealed-for-life ball bearing)

    • Non-Drive End: 6314 (sealed-for-life ball bearing)

  • Overspeed Capability: 120% of rated speed (2250 rpm)

  • Leads: 12 leads, reconnectable (star, delta, parallel)

  • Moment of Inertia (WR²): 4.63 kg·m² (single bearing), 4.43 kg·m² (double bearing)

  • Weight:

    • Complete Alternator: 1024–1030 kg

    • Stator: 470 kg

    • Rotor: 377–400 kg

Regulation & Control

  • Excitation System: Self-excited, brushless

  • AVR Models: SX460 (standard), SX440, AS440, MX341, MX321 (PMG optional)

  • Voltage Regulation Accuracy: ±1.0%

  • Parallel Operation: Supported (optional AVR required)

  • RFI Suppression: Complies with BS EN 61000-6-2 & BS EN 61000-6-4, VDE 0875G/N

  • Low-Speed Voltage Drop Protection: Standard feature

  • Standards Compliance: IEC60034, BS5000, NEMA MG1-22, ISO8528-3

  • Certification: ISO9001 quality assurance

Environmental Parameters

  • Operating Temperature: –15°C to +40°C

  • Relative Humidity: Up to 95% (non-condensing)

  • Altitude: Up to 1000 m without derating

  • Noise and Vibration: Conforms to BS6861 mechanical balance standard

Performance Summary

  • Voltage Dip (Transient Load): ≤25% at 0.8 power factor

  • Recovery Time: <0.5 seconds

  • Locked Rotor Motor Starting: >300% rated current

  • Efficiency Range: 93.5–94.3% across load range

  • Applications: Prime power, standby, rental, telecom, mobile lighting towers, and refrigeration systems

Datasheet

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